class Mark:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        pass
class Person:
    # 对象初始化的时候就会被调用
    def __init__(self, name, age):
        self.name = name
        self.age = age
        self.landmark = []
        pass
person = Person('球球', 18)
mark1 = Mark(10,20)
mark2 = Mark(30,50)
mark3 = Mark(40,60)
person.landmark.append(mark1)
person.landmark.append(mark2)
person.landmark.append((mark3)